public class ThreadDemo1 {
    public static void main(String[] args) throws InterruptedException{
        Object locker = new Object();
        Thread t1 = new Thread(() -> {
            try {
                System.out.println("wait 开始");
                synchronized (locker) {
                    locker.wait();
                    System.out.println("wait 再次加锁了~~~~~");
                }
                System.out.println("wait 结束");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
        });
        t1.start();
        Thread.sleep(1000);

        Thread t2 = new Thread(() -> {
            synchronized (locker){
                System.out.println("notify 开始");
                locker.notify();
                System.out.println("notify 结束");
            }
        });
        t2.start();
    }
}
